﻿/*
 * Copyright 2012 Rene Prost, Registrite ja Infosüsteemide Keskus 
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */
using System;

namespace Xtee.CodeDom
{
    public static class TypeExtensions
    {
        public static bool IsNumeric(this Type type)
        {
            switch (Type.GetTypeCode(type))
            {
                case TypeCode.Byte:
                case TypeCode.SByte:
                case TypeCode.UInt16:
                case TypeCode.UInt32:
                case TypeCode.UInt64:
                case TypeCode.Int16:
                case TypeCode.Int32:
                case TypeCode.Int64:
                case TypeCode.Decimal:
                case TypeCode.Double:
                case TypeCode.Single:
                    return true;
                case TypeCode.Object:
                    if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
                    {
                        return Nullable.GetUnderlyingType(type).IsNumeric();
                        //return IsNumeric(Nullable.GetUnderlyingType(type));
                    }
                    return false;
                default:
                    return false;
            }
        }
    }
}